Lisa Simpson Was Wrong About the Coriolis Effect

The Citizen's Guide to the Future
July 10 2013 6:52 PM

Lisa Simpson Was Wrong About the Coriolis Effect, and Six Other Total Science Bummers

The Coriolis effect on toilets
This has nothing whatsoever to do with the Earth's spin.

Sergey Yechikov /

Science is fun, except when it’s utterly devastating. Mental Floss today has a video that lays waste to 50 popular science misconceptions in less than eight minutes, and did you know that stars don’t twinkle, diamonds don't come from coal, and a duck’s quack does echo?

Will Oremus Will Oremus

Will Oremus is Slate's senior technology writer.

OK, so the majority of these revelations aren’t going to shock those of you who passed eighth-grade science, let alone subscribe to Nature. Still, there are enough busted myths here that most people should be able to walk away with at least a couple of their treasured beliefs shattered. Here are seven of the most potentially life-altering—and if your reaction to all of these is “duh,” feel free to try your luck on the other 43 by watching the full video below.

1. The brontosaurus never existed. Rather, in the 1880s an overzealous paleontologist mistook an Apatosaurus skeleton for a new species. The mistake was discovered in 1903, but the Brontosaurus lived on in museums until the late 1970s and in pop culture even longer, probably because it has a way cooler name.
Further reading: NPR has
the full story, while Brian Switek covered this and other dino myths in Slate earlier this year.


2. There is no dark side of the moon. At least, not a permanent one. It’s true that one side of the moon is always turned away from us, but it gets just as much sunlight as the side we see.
Further reading: Plait
covered this on his Bad Astronomy blog in its pre-Slate days.

3. Adding salt doesn’t make water boil faster. It actually raises the boiling point slightly, but in any case the difference is insignificant for cooking purposes.
Further reading: Mike Damann of the Southwest Research Institute has
a thorough rundown of the chemistry involved.

4. Sally Ride was not the first woman in space. Not even close. Soviet cosmonaut Valentina Tereshkova got there in 1963, a full 20 years before Ride.
Further reading: Slate
’s Laura Helmuth examined why it took NASA so long to send a woman into orbit.

5. Bald eagles don’t sound anything like they do on The Colbert Report. That piercing shriek on the show’s intro is probably from a red-tailed hawk. As Mental Floss’ Hank Green points out, our fierce national bird actually sounds more like “a cross between a squeaky toy and a seagull.”

6. The lifespan of a house fly is not 24 hours. The damned things can buzz around for 20 to 30 days. Sorry.

7. The Coriolis effect has nothing to do with which way the water circles when you flush your toilet. Lisa Simpson was wrong—the amount of water in your toilet is far too small to be significantly influenced by the Coriolis effect. If you want to know why it drains clockwise or counter-clockwise, try looking at which way the water comes out of the jets.
Further reading: Plait
tackled this one too, as have plumbing experts.

There now. If it makes you feel any better, Mental Floss’ rundown also includes some happier truths, like the fact that you don’t accidentally swallow eight spiders a year and alcohol doesn’t actually kill brain cells. One quibble with the video’s conclusion: Green is right that correlation doesn’t imply causation, but as Slate’s Daniel Engber pointed out last year, mindlessly repeating that maxim isn’t particularly helpful either.

Future Tense is a partnership of SlateNew America, and Arizona State University.


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